base/memory/discardable_memory_shmem_allocator.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
   6 #define BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
   7
   8 #include "base/base_export.h"
   9 #include "base/memory/scoped_ptr.h"
  10
  11 namespace base {
  12 class DiscardableSharedMemory;
  13
  14 class BASE_EXPORT DiscardableMemoryShmemAllocator {
  15  public:
  16   // Returns the allocator instance.
  17   static DiscardableMemoryShmemAllocator* GetInstance();
  18
  19   // Sets the allocator instance. Can only be called once, e.g. on startup.
  20   // Ownership of |instance| remains with the caller.
  21   static void SetInstance(DiscardableMemoryShmemAllocator* allocator);
  22
  23   virtual scoped_ptr<DiscardableSharedMemory>
  24   AllocateLockedDiscardableSharedMemory(size_t size) = 0;
  25
  26  protected:
  27   virtual ~DiscardableMemoryShmemAllocator() {}
  28 };
  29
  30 }  // namespace base
  31
  32 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_